Patent GB-748756-A (GB)
Abstract: 748,756. Calculating-apparatus. SOC. ANON. DES BREVETS LOGABAX. Aug. 7, 1951 [Feb. 12, 1951], No. 18627/51. Class 106 (1) In a full-keyboard calculating machine, stop bars which select one or more totalizers and the operation to be performed, are differentially positioned under the control either of control keys or of vertical bars in turn differentially positioned, in accordance with the columnar position of a travelling paper carriage, under the control of notched bars secured to the carriage. The machine described has two sections of totalizers, each containing nine, a column of totalizer-selecting keys for each section, and a single column of function-selecting keys. Unless another function is selected, addition is performed as described in Specification 730,465. Specifications 647,520, 709,526, 730,466 and 748,257 also are referred to. Totalizers. Each totalizer comprises racks 12, Fig. 5, guided by pins 11 in slides 10 supported in a frame 9. Two frames 9, Fig. 1, corresponding with the two sections A<SP>1</SP>, A<SP>2</SP> of the machine, each accommodate nine totalizers. Each totalizer is normally held by springs 64 so that teeth on the racks 12 are engaged by locking bars 65, but the totalizer may be shifted by means of a plate 13 engaging pins 14 in the slides 10 to engage further teeth on the racks with driving members 98, equal in number to the racks, by which the slides are moved longitudinally. ' Totalizer-selection. Depression of a key 93, Fig. 1, selects a corresponding totalizer of the front section A<SP>1</SP> for actuation. A totalizer in the rear section A<SP>2</SP> may be similarly selected by depressing a key in a second column of selecting keys. A stop bar 28 associated with the keys 93 is freed for rearward movement to a position determined by the depressed keys by a bar 30 mounted between cam-controlled slides 31. The stop bar is driven rearwardly by a spring 164 (see also Fig. 13) acting on a slide 22 carrying a stud 23 which drives the stop bar through a lever 25. Teeth on the slide 22 mesh with a pinion 21 on a shaft 16 carrying ten helically arranged radial pins 15, one of which is thus arranged with a nose 180 of the plate 13 of the corresponding totalizer. The rack 22 and shaft 16 are mounted in a frame 17 rockable about a shaft 20, and in order to engage the selected totalizer with its driving members, this frame is rocked by releasing a locking lever 53. Function-selection. The machine normally adds unless a different operation is selected by depression of one of a column of keys 92, Fig. 4, comprising a subtraction key and total and subtotal keys for the front and rear sections respectively. A stop bar 91 co-operates with these keys and positions, through an extension 90 and a lever 87, Fig. 13, a slide 82 in accordance with the depressed key. A notch 85 in the slide 82 is thus positioned to free a selected one of five levers 73, 74, 73<SP>1</SP>, 74<SP>1</SP> and 75. The levers 73 and 74 are pivoted to a control bar 67 controlling the engagement of the front section totalizers, while the levers 73 and 74 are pivoted on a control bar 68 associated with the rear section. The levers 74 and 74<SP>1</SP> determine total-taking operations ; the levers 73 and 731, sub-total-taking. The lever 75 is pivoted to a bar 69 which controls the subtraction operation in both sections. When one of these levers is released by the slide 82, it is urged upwardly by a spring and a projection 185 thereon is engaged by a flange 81 formed on a cam lever 78 which drives the lever and the control bar on which it is pivoted forwardly. Subtraction. Fugitive-one arrangements. When the subtraction key has been depressed, a corresponding control bar 69, Fig. 4, is moved forwardly as described above. A lug 186 (see also Fig. 7) on this bar rocks a latch 187 to free a frame 190 in which the amount stop bars are mounted for lateral movement by a spring 193. Complementarily arranged stops are thus arranged to co-operate with the keys, so that the nines complement of the amount set up is added into the selected totalizers. The frame 190 is restored at the end of the cycle by a lug 198 on the function-control stop bar 91 which rocks a lever 199 engaging a nose 200 of the frame. Transferring totals. Total keys are provided for the front and rear sections, the total being taken from that totalizer of the corresponding section selected by the totalizer-selecting keys. If a totalizer-selecting key of the other section is also depressed', the total will be transferred to that totalizer. When 'a total is to be taken from the front section, for example, the control bar 67, Fig. 13, is moved forwardly by the lever 74, as described above, and rocks the locking lever 53 of the front section to engage the selected totalizer in that section. A lug 202, Fig. 7, on the bar 67 rocks a lever 203 to operate a slide 204 which rocks all of the amount key detent bars to release any depressed keys and rocks the zero stops to ineffective positions. Thus during the rearward movement of the driving bars 103, Fig. 2, the members 98 drive the totalizer racks 12 to their zero positions against stops 162. The driving bars 103 and and the connected stop bars 113 arethus positioned according to the total. The selected rear totalizer is then engaged, its frame. 17 being rocked by a spring 42 previously tensioned by a cam which moves to the rear a bar 45 carrying slides 43 to which the springs are secured. The slides are controlled by springs 46. The bar 45 is then freed by its cam, whereupon the front slide 43 is restored by its spring 46 to rock the frame 17 so as to disengage the front totalizer, the front locking lever 53 being held inoperative by the control bar 67. During the restoration of the driving bars 103, the total taken from the selected front totalizer is entered into the selected rear totalizer. Transferring subtotals. The operation is similar to total-taking but each of the control levers 73, 73<SP>1</SP>, Fig. 13, released in subtotal operations in the front and rear totalizers respectively has an arm 77, Fig. 4, which in the middle of the cycle, is engaged by a pin 229 in a cam-controlled arm so as to unlatch the lever from the flange 81. The control bar 67 or 68 is then restored by a spring to allow the corresponding locking lever 53 to become effective prior to the release of the bar 45. Consequently, the totalizer which has been zeroized remains engaged during the restoration of the driving bars 103 and the amount is re-entered. Paper carriage and driving mechanism. The platen 219, Fig. 2, is mounted between plates 230 rockable about a shaft 231 supported in a frame comprising plates 232 (see also Fig. 1) and bars 233, 234. A torsion spring 235 urges the platen upwardly to a front-feed position, but the platen may be depressed by fingerpieces 239 to the printing position in which it is held by catches 237 which engage hooks formed on the plates 230. The latches may be rocked to release the platen by a hand-lever 240. The bars 233, 234 of the carriage are supported by rollers co-operating with rails 242, 243 of the main frame. The carriage is driven electrically in both directions, a gear 246, Fig. 2, meshing with a rack 245 carried by a bar 244 of the carriage frame, being driven either by a gear 273, Fig. 8, or a gear 274, the driving gear being clutched to the corresponding one of a pair of meshing gears 263, 264 driven by the electric motor. Each clutch comprises pawls 267 mounted on the driving gear which cooperate with a ratchet wheel integral with the driven gear. The pawls are controlled by collars on the shafts 275, 276 about which the driving and driven gears rotate, the shafts being moved longitudinally by a lever 281 fast with a plate 287 and co-operating with sprung balls 286 which determine three positions of the lever-a central position in which neither clutch is engaged, and a position on each side in which one of the clutches is engaged and the other disengaged. Line-spacing. The rack bar 245, Fig. 1, is slidably mounted on the carriage bar 244, and when it is driven to the right, it moves a short distance relatively to the carriage, rocking, through a link 247, a lever 248 which in turn rocks a lever 252 so as to operate a line-spacing pawl 255 co-operating with a ratchet wheel 257 fast with the platen. Line-spacing thus.occurs during each return movement of the carriage and also during a normal machine operation under the control of the hand-lever 322 described below. Control of carriage tabulation and return..A hand-lever 322, Fig. 11, may be operated in one direction or the other to cause the carriagedriving mechanism to function, in the normal machine operation, to tabulate the carriage or line-space the platen. The lever 322 positions axially a rod 290 so that when a plate 291, Fig. 2, thereon is rocked by a pawl 294 on a cam-controlled arm 293, the plate 291 engages on one side or the other of a roller 288 carried by the control plate 287 to rock the latter in one direction or the other to operate the carriagedriving mechanism. In the case of a tabulation, the drive continues until the next columnar position as determined by column stops adjustable on a bar of the carriage. As the carriage stop engages the nearer of two stop members 297, the latter is cammed rearwardly against a spring 303 acting on a lever 300 engaging a groove in the member 297, its sliding movement being guided by pins 299, 306. The carriage stop then engages the edge of the other member 297 which is rocked about its pin 299 against a spring 305 acting on a lever 304 contacting the member 297. An edge of the lever 304 engages a stud 307 in the control plate 287, Fig. 8, which is thus restored to disconnect the drive. The carriage is then accurately located in position by the spring 305 which, through the lever 304, returns the carriage stop into engagement with the opposite member